The idea being expressed by this wording is a little strange. You can talk about the concept of privacy anywhere, anytime -- how important your privacy is, what effect the new electronic age has on personal privacy, how government actions affect our privacy, etc. etc. To just talk about the subject of privacy doesn't mean you are saying anything about your own private life. Is it possible you mean "to talk privately in public" ... not "privacy"? If so, then we DO have an issue, because it is NOT always easy to have a private conversation in some public places. People close by may hear what you are saying, or you may be trying to speak very quietly and there is too much noise or commotion nearby to do that -- like on crowded metro train. Now we can deal with the word "convenient", which normally has to do with time and location ... ... "It's not convenient for me to come by right now. I must go to the bank first." ... "We will schedule the interview for a time that is convenient for you." In other words, if the time is OK, and the place is OK, then the action in question is "convenient" -- and that word doesn't quite apply to the statement as I have redefined it. A better word would be "conducive" -- making a certain situation or outcome likely or possible. So here's what I end up with: "Public places are not always conducive to talking privately." I realize this is quite a change from your original wording, and if I've missed your point, I apologize. In any event, I hope you learn something from my answer.

I think "appropriate" is better.